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<H1>fd_eval(?C)</H1>
Evaluate and state the constraint expression C.


<DL>
<DT><EM>?C</EM></DT>
<DD>An arithmetic constraint expression.
</DD>
</DL>
<H2>Description</H2>
   This predicate is used to enforce the evaluation of a given constraint
   expression on runtime, without macro expansion.  This can be useful in
   situation where the compile-time macro expansion cannot process its
   argument properly, because it has no type and mode information about the
   variable arguments.

<P>

<H3>Fail Conditions</H3>
   Fails C fails.


<H3>Resatisfiable</H3>
   No.
<H2>See Also</H2>
<A HREF="../../lib/fd/isd-2.html">isd / 2</A>
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